A navigation system for navigating a three-dimensional scene that includes a model or object with which a user can interact. The trigger switch has a housing having a housing venthole, a contact mechanism disposed in the housing, and a trigger that, when depressed into the housing, drives the contact mechanism. The light collecting unit is arranged on a surface of the body of the space machine to collect incident sun light inside the body. Another method of the present invention includes generating an ultra-wideband pulse that comprises a plurality of time bins, with each time bin representing a first data symbol. An optical element, such as a filter, is supported on the first element holding tube.